VisualVM is a powerful tool used for monitoring and troubleshooting Java applications from version 1.4 onwards, supporting a variety of technologies such as jvmstat, JMX, Serviceability Agent (SA), and Attach API from different vendors. It is designed to meet the diverse needs of application developers, system administrators, quality engineers, and end users alike. For each running process, VisualVM displays essential runtime details including the process ID (PID), main class, arguments supplied to the Java process, JVM version, JDK home directory, JVM flags, and system properties. Additionally, it tracks various performance metrics such as CPU usage, garbage collection (GC) activity, heap and metaspace memory usage, the number of loaded classes, and the count of currently running threads. VisualVM also includes basic profiling features that allow for in-depth analysis of application performance and memory management, offering both sampling and instrumentation profiling options to cater to different analysis needs. This comprehensive set of tools makes VisualVM an invaluable resource for anyone looking to optimize their Java applications effectively.